Upgrade Rust toolchain to 1.84.0 (#10533)

## Summary
Upgrade the rust toolchain to 1.84.0. This PR does not bump the MSRV.

crates/uv-python/src/discovery.rs

@@ -1154,7 +1154,7 @@ pub(crate) fn is_windows_store_shim(path: &Path) -> bool {
             component.starts_with("python")
                 && std::path::Path::new(component)
                     .extension()
-                    .map_or(false, |ext| ext.eq_ignore_ascii_case("exe"))
+                    .is_some_and(|ext| ext.eq_ignore_ascii_case("exe"))
         })
     {
         return false;

crates/uv-python/src/installation.rs

@@ -78,12 +78,12 @@ impl PythonInstallation {
     /// Find or fetch a [`PythonInstallation`].
     ///
     /// Unlike [`PythonInstallation::find`], if the required Python is not installed it will be installed automatically.
-    pub async fn find_or_download<'a>(
+    pub async fn find_or_download(
         request: Option<&PythonRequest>,
         environments: EnvironmentPreference,
         preference: PythonPreference,
         python_downloads: PythonDownloads,
-        client_builder: &BaseClientBuilder<'a>,
+        client_builder: &BaseClientBuilder<'_>,
         cache: &Cache,
         reporter: Option<&dyn Reporter>,
         python_install_mirror: Option<&str>,
@@ -127,9 +127,9 @@ impl PythonInstallation {
     }
 
     /// Download and install the requested installation.
-    pub async fn fetch<'a>(
+    pub async fn fetch(
         request: PythonDownloadRequest,
-        client_builder: &BaseClientBuilder<'a>,
+        client_builder: &BaseClientBuilder<'_>,
         cache: &Cache,
         reporter: Option<&dyn Reporter>,
         python_install_mirror: Option<&str>,

crates/uv-python/src/interpreter.rs

@@ -894,10 +894,10 @@ mod tests {
 
         fs::write(
             &mocked_interpreter,
-            formatdoc! {r##"
+            formatdoc! {r"
         #!/bin/bash
         echo '{json}'
-        "##},
+        "},
         )
         .unwrap();
 
@@ -913,10 +913,10 @@ mod tests {
         );
         fs::write(
             &mocked_interpreter,
-            formatdoc! {r##"
+            formatdoc! {r"
         #!/bin/bash
         echo '{}'
-        "##, json.replace("3.12", "3.13")},
+        ", json.replace("3.12", "3.13")},
         )
         .unwrap();
         let interpreter = Interpreter::query(&mocked_interpreter, &cache).unwrap();

crates/uv-python/src/lib.rs

@@ -282,10 +282,10 @@ mod tests {
             fs_err::create_dir_all(path.parent().unwrap())?;
             fs_err::write(
                 path,
-                formatdoc! {r##"
+                formatdoc! {r"
                 #!/bin/bash
                 echo '{json}'
-                "##},
+                "},
             )?;
 
             fs_err::set_permissions(path, std::os::unix::fs::PermissionsExt::from_mode(0o770))?;
@@ -304,10 +304,10 @@ mod tests {
 
             fs_err::write(
                 path,
-                formatdoc! {r##"
+                formatdoc! {r"
                 #!/bin/bash
                 echo '{output}' 1>&2
-                "##},
+                "},
             )?;
 
             fs_err::set_permissions(path, std::os::unix::fs::PermissionsExt::from_mode(0o770))?;
@@ -525,10 +525,10 @@ mod tests {
         #[cfg(unix)]
         fs_err::write(
             children[0].join(format!("python{}", env::consts::EXE_SUFFIX)),
-            formatdoc! {r##"
+            formatdoc! {r"
         #!/bin/bash
         echo 'foo'
-        "##},
+        "},
         )?;
         fs_err::set_permissions(
             children[0].join(format!("python{}", env::consts::EXE_SUFFIX)),